Abstract
We here report on studies of low temperature dynamic elastic properties of an amorphous ribbon of a FINEMET alloy, with and without magnetic field. Characterization with XRD and SEM showed that the sample was partially amorphous. Magnetization study showed the system as ferromagnetic and there was no transition in resistivity, anomalous peaks in sound velocity and internal friction measurements, with a small hysteresis and strong magnetic field dependence, were found in this temperature range. After analysing the data we concluded that it was magnetic in origin. This is reported for the first time in the FINEMET system.
Highlights
To 140K), with and without applied magnetic field
We found surprising anomalies in this temperature range
To the best of our knowledge, this is the first such report on elastic property measurements done on this system at low temperature and showed unexpected behavior in this temperature range
Summary
The high field behavior showed easy saturation within 1kOe, and the Ms was around 150emu/gm, similar to bulk Fe (217.6 emu/gm) and Ni (55 emu/gm) systems.[16] This showed that the system had a very low magnetocrystalline anisotropy energy and low magnetostriction. These two are important technical parameters for applications. The elastic properties were measured continuously as a function of temperature from room temperature (300K) down to 140K and heated back The Q 1 was about an order of magnitude larger, this increase in attenuation must be coming from amorphousness of the metglass, wherein the fine particles were presumably offering more scattering to the phonons
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